Fill in the blanks in the following graph, which illustrates the decay curve of a radioactive element used to date fossil structures.

Verified step by step guidance

1. Identify the y-axis label, which is 'Percentage of remaining'.
2. Identify the x-axis label, which is 'Number of half-lives'.
3. Locate the point on the graph where the y-axis value is 25%.
4. Determine the corresponding x-axis value for the 25% y-axis value.
5. Fill in the blanks: 'Using this decay curve, we can see that a value of 25% remaining on the y axis corresponds to [x-axis value] times the number of half-lives.'